Stoker burner head with rod means to anchor tuyere blocks



Eh 2%,, E956 H. W. GEARY 2 49989 STOKER BURNER HEAD WITH Rop MEANS T0ANCHOR TUYERE BLOCKS Filed Dec. 13, 1947 Fig.2.

.1mmmmmummummmmunmnmu Inventor: Henry R. Gea'rg,

b9 6% mm His Attorneg.

Patented Feb. 28, 1950 .ii

HenrysrRii.GearmtEast; Orange, N.- J 5, assignou to Gneral -iElectricCompany, ,1 a, corporation of NemYdrk Application-December-13, 1947;sentiments (01. 110-44.)

2: Claims 175 The*present invention relatesito' stdkersiipar ticularlythe tuyre and plenumbaseeassembly One object is to provide an improvedforin of sectional-lined tuyre suitable fdr automatic-coal stckers andcapable of produc orfiii'ely vanities streams *of air of equalizedvelocity and direc-ted slightiy"dovv-rliirardly and op positelyinto theu'el-bed from surrounding juxering zone.

Anothewobiect is to provide"an-"improved iorm off'tapering*tuyereelement oi telativelylow eat storagemassandhaving a sharply-=rounde dgetop and oppositely si6ping ffiiih-t" arid -back wal1s* and a ce-ntrarmounting web extendihgw tl'ieree' i. between toformdivisi-veairflow'channels taperingupwardly"to-rows"of' air discharge"sldts -provided" in the upper edges-"of the wall sfio" as to *con'centrate 'the 'combustion'in the upperpart "bf-the "fuel" bed with minimum"heating of the 1 green fuel' during both fuel 'ie'ed' operation and'shutdowni' Another-objectis to provide-a-burning head zfo'r a *stoker"with *an dmprovedplenum base l'iavin'g a 'clean'out door'and both coal*andair supply-lines removably' connected therewithand having im:

proved meansifor "remove-ply mount-ingopposite rows of tuyere elementsin alignment thereon to provide a" rectangular" upwardly expanding firebed.

Other objects" and advantages of the invention Willi appear i in thefollowing tde'scription of. the accompanying drawing in WhichrEig; 1isi'a'sec tional view of a stokerl burning head embodying theimprovements of the present "invention in a preferred: form; Fig. 2 istan-"end view showing more clearlythecoalfeedi an'd ai-r suppl y' -pipesand cleanout doon symmetricaliconnection 111 the plenum base' of -theburning-headfibt Fig. l-:- Fig-ii 3 is -a top vi'e'wlpartly in-section9'sh0wing :th'e rows ofjuxtaposed -tuyereelements in'ountedon-nthe plenumbase betweenthe corner lanehoring tuyre elementsaround "arectangulam'coal feed throa't or' bpening -fdrmed-centrally-in thetop oftlie base with the tuyere-elements-communicating -w the air sletsprovidedadjacent each side of 't e rectangular opening; Fig. 4 is aperspective view of the improved form of tuyere element with a mountingrod extending therethrough; and Fig. 5 is a perspective View of thecorner tuyere element that anchors each end of the mounting rod.

g 'adjacent rows s to provide associated diverging air streams topromote rapid' combin tidn of 'fuel movingf outof" the-*fuel bed over hearched "tops of thetuye'i'e'eleinents-intd the cli'nk As shown-fin Fig;1, theimproved' plenum'ba'se" lfl ifor 'the-tuyerespreferablyds cast asa unit and provided with an internal-"coal 'feedipassage in the to"rectangular transition. The cylindrical 1 portion I 2 re ceives thedeliverysend of the coal feed screw I 3:

form of! a cylindrical elbow tube= I I;

that conveys the "coalthroughi the coal feed pipe l4.'. The feedpipesI4is 1carried':bya plate I5;' secured-1 to I one 'side' of the plenum:base Ifiand mayrbe' connected" together pipe I4 to an automatic stbkerthat is removably with the coal feed mechanism, not-" shownxr Theupwardlyiiiaring cylindrical towrectangular minimum -degradationandisegregation' sureissupplied to the f-plenumichamber I'I through atriangularlyfishaped hair 1 supply pipe I8 that-is 5 l5 in'ifixe'dalign- Thewremovable; l5*"a1so carries a separately removably' tri'angula'rly -shaped cieanoutdoor I 9 symmetrically F locatedoin reversedrelation":with':the triangularly shaped; air supply: pipe 1' I fl aso"that :"thei-co'al' feed"- pipea' I 4 =is1 nestedi therebetweem The 1cleanout 1 deep I 9 provide's access to *thiplenurh 'chamber I? forremovingany accumulated' fash, riddlings" The plate I5 is 're'movabiyl'secured toz basei I 0 byzbolts 20 so that thei air supplypipe: Icommunicates" with thes plen'um chamber I I throi'zgh the'triangnil'arly. shaped: opening 2| formed in'r'theaside of plenum base:1 land the carried-by the:removab1e :plate mentwith' the- 'coal -feedpip'e v I 4: plate se-paratelylremovable"'cleanout cover-I 9 communi:

as ito pressurizeFthe":tube II sufiiciently .to*pre-" vent backfiow ofcombustion" gases An upwai'dlyi' 'expandingsrectangular fuel" bed isLprovi-de'd for "the active combustion of the fuel above the fuel iee'dopeningi fl "byaoppositerows oiz j uxtaposeditaperingituyere elenients'25"-in' con.- junctitin -witt1 the i sloping 'curved T I cornertuyre"elements 26. Each tuyre element preferabl is cast of a high chromiumsilicon alloy to increase the resistance to scaling and oxidation. Eachintermediate tuyere element 25 is arched so as 7 straddle the airdischarge slots 28 formed in transition'i-outlet: I 6 of the elb'ew"tube "I I servesvto" quickly: divert-the:horizontalfibwmfPcoalafvertically upwardly. with' i the top of theplenum base l adjacent each side of the rectangular fuel feed opening 24therein. As shown in Figs. 2 and 3 each corner tuyere element isremovably mounted on top of the plenum base l0 by a screw 29 thatengages with a suitably threaded hole 30 and serves to anchor the endsof the mounting rods 3| that extend through the adjacent rows of tuyereelements 25.

As most clearly shown in Fig. 4 each tuyre element 25 is provided with asharply rounded ridge top 35 having the steeply sloping front and brokenslope back walls 36 and 31 extending therefrom to form a hunchbackedarch. A transverse web 38 extends between the oppositely sloping frontand back walls of the tuyere 25 so as to form a juxtaposed pair ofupwardly tapering airflow channels 39 and 40 on opposite sides of theweb 38. A downwardly tapering opening 38' is provided in the web 38 forreceiving the mounting rod 3| therethrough to effect self alignment ofthe adjacent tuyre elements and also for providing progressivelyunrestricted communication between the airflow channels 39 and 40.Opposite pairs of downwardly inclined air discharge slots 44 and 45 areformed in the upper edges of the front wall 36 and a pair of oppositelydirected restricted airflow channels 46 and 41 are formed in the upperedges of the broken slope back wall 31 to supply sufficient air forcompleting combustion of the fuel passing over the round ridge top 35.

In mounting the tuyere elements 25 and 26 on the top of the plenum baseII], the number of edgewise slotted tuyere elements 25 required to forma side of the desired length for the rectangular fuel bed are aligned ina row and. the mounting rod 3| extended through the opening 38' formedin the central mounting web'i38 of each element. The protruding ends ofthe mounting rod 3| are then inserted in the anchoring socket 32 of theadjacent corner elements 26. When the tuyre elements are thus assembled,the flanges 33 formed at the sides of the corner tuyere element 26 serveto close the adjacent airflow channels of the adjacent tuyre blocks andthe curved ridge top 34 serves to interconnect the round ridge tops 35of the adjacent rows of tuyre elements 25. In this way each row ofedgewise slotted tuyere elements 25 is readily mounted on the top of theplenum base I0 by tightening the holddown screws 29 for thecorresponding corner tuyere elements 26. The juxtaposed tuyre elements25 on rod 3| are selfadjusting into straddling alignment with thecorresponding air discharge slot 28 to bring each airflow channel 39 and40 and slots 44, 45, 46 and 41 on opposite sides of the mounting web 38into registering alignment and in communication with the plenum chamberand thus insure a substantially equalized distribution of the combustionair thereto. Furthermore, the perforate web of each element provides forinterconnecting the adjacent airflow channels of the adjacent blockstherethrough so as to tend to equalize the supply of air between themultiplicity of air discharge slots in case any of these slots shouldbecome clogged or plugged during operation of the stoker. However, thedownward inclination of the slots formed in the front wall of eachtuyere element tends to prevent entrance of ashes or riddlings into theinterior of the tuyere elements and the location of the air slots 28directly therebelow serves to prevent any accumulation of ash orriddlings inside thereof. The removable cleanout door enables readyremoval of any accumulation of ashes 0r riddlings falling through theair slots 28 into the plenum chamber The round ridge tops 35 of thetuyre elements 25 with the oppositely sloping walls 36 and 31 extendingtherefrom serve to separate the active combustion fuel bed surrounded bythese elements from the surrounding clinkering zone for completingcombustion of the coal and fusion of the ash. Due to the tapering archedshape of the tuyere elements 25 there is a minimum of heat stored inthese elements during stoker idling periods. Furthermore, during stokeroperation the round ridge top 35 of the tapering tuyere elements 25 areeffectively cooled by the air passing upwardly through the side channels39 and 40 to the slots 44, 45 and 46 located in the upper part of thefront and back walls adjacent to the top 35.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1. A stoker burning head having in combination a plenum base providedwith a rectangular fuel feed opening and an air supply slot at each sideof said opening, tuyere corner blocks, each mounted on said baseadjacent a corresponding corner of said opening, and opposite rows ofjuxtaposed tuyere blocks, each row having a mounting rod extendingtherethrough for engaging with adjacent corner blocks to mount said rowof tuyere blocks therebetween in communicating alignment with acorresponding air supply slot.

2. A stoker burning head having in combination a plenum base providedwith a fuel feed opening, corner anchor blocks, each arranged on saidbase adjacent a corresponding corner of said opening, a row ofjuxtaposed tuyre blocks arranged on each side of said openingintermediate corresponding pairs of said corner anchor blocks, ananchoring rod extending through each row of said tuyre blocks andanchored in the corresponding pair of said corner anchor blocks, meansfor attaching said corner anchor blocks to said base to secure saidtuyere blocks in alignment to said base, and means for supplying airunder pressure from said base to said tuyere blocks.

HENRY R. GEARY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 935,954 Benner Oct. 5, 19091,620,056 Beers Mar. 8, 1927 1,836,395 Rich Dec. 15, 1931 2,118,104 PeckMay 24, 1938 2,123,397 Bohmker July 12, 1938 2,143,898 Ostrin Jan. 1'7,1939 2,171,958 Zehrbach Sept. 5, 1939 2,286,268 Fitch June 16, 19422,366,966 Julyan Jan. 9, 1945 2,392,189 Riddell Jan. 1, 1946

